CN101061297A - System and method for processing an accelerometer signal to assist in combustion quality control in an internal combustion engine - Google Patents
System and method for processing an accelerometer signal to assist in combustion quality control in an internal combustion engine Download PDFInfo
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- CN101061297A CN101061297A CN200580039312.2A CN200580039312A CN101061297A CN 101061297 A CN101061297 A CN 101061297A CN 200580039312 A CN200580039312 A CN 200580039312A CN 101061297 A CN101061297 A CN 101061297A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1497—With detection of the mechanical response of the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/028—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the combustion timing or phasing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/025—Engine noise, e.g. determined by using an acoustic sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0097—Electrical control of supply of combustible mixture or its constituents using means for generating speed signals
Abstract
A method for processing an accelerometer signal associated with the combustion process in an operating internal combustion engine, the method comprising the steps of measuring an accelerometer signal across a window of selected crank angle degrees during a cycle of the engine, the measured accelerometer signal including a combustion acceleration component and a motored acceleration components; and applying a shape function to the measured accelerometer signal to reduce the motored acceleration component.
Description
The cross reference of related application
The application relates to and requires on November 18th, 2004 that submitted to, name to be called the preference of the U.S. Provisional Application No.60/629489 of " Accelerometer-Based Combustion Sensor ".The full content that should apply for for ' No. 489 is here introduced with for referencial use.
The application is the part continuation application that submission on April 12nd, 2004, name are called the U.S. Patent application No.10/822333 of " Method And ApparatusFor Controlling An Internal Combustion Engine UsingAccelerometers ".Should ' 333 application relate to and require on 06 30th, 2003 that submit to, names to be called the U.S. Provisional Application No.60/483 of " Method AndApparatus For Controlling An Internal Combustion Engine UsingAccelerometers ", 855 preference.Should here introduce with for referencial use by ' 333 and ' 855 full contents of applying for.
Technical field
The present invention relates to a kind of method and system of in internal-combustion engine, determining burning quality, more particularly, the present invention relates to a kind of purposes burning quality, combine accelerometer together with Digital Signal Processing (DSP) technology that is used for determining, wherein the burning quality indicator comprises: (i) burning phase, the indicator that comprises burning beginning (SOC), (ii) rate of combustion; (iii) catch fire or partial combustion; And the (iv) too fast rising of cylinder pressure (pinking), but be not limited to this.
Background technique
Traditional combustion engine such as diesel engine or spark ignition engine need be controlled the SOC of burning quality feature such as efficient and emission control.For example, diesel engine is by fuel injection timing control burning beginning, and spark ignition engines is controlled the burning beginning by ignition timing.
But auxiliary combustion is controlled on the conventional engines to be desirable and also to be needs on other motor.The example of benefiting from the motor of feedback burning quality sensor strongly be to use the HCCI type to burn to turn round that is a kind of.Different with traditional SI or diesel engine, the HCCI burning spontaneously takes place, and normally, takes place equably, and do not have the flame transmission.The HCCI burning is the compression ignite that has carried out fine premixed burning/air mixture relatively.Develop various combustion strategies according to the HCCI principle.For example, the combination of hcci engine and conventional engines spraying technique can cause premixed charge compression-ignition (PCCI), and wherein air/fuel mixture is still needed not to be uniform by premixing.Auxiliary combustion strategies is such strategy, promptly should replenish the energy that is provided by the PCCI combustion process with direct injection fuel amount by strategy, wherein in case the burning beginning just provides this fuel quantity usually.This motor is known as premixed charge and directly sprays (PCDI) motor.
A problem of hcci engine is, burning quality is to comprising MAT, fuel/air mixture ratio, fuel mass, residual gas part and the amount of exhaust gas recirculation and other the quantity of parameters sensitivity of catching.Influence under the situation of parameter of burning quality in control, will run into bigger circulation-to-circuit burning quality variation.Therefore, compare with the SI motor, be easy to generate and catch fire and too fast pressure rising speed with conventional diesel engine.The knowledge of the time of burning beginning (be SOC or it be sometimes referred to as the burning phase) helps the control strategy that provides such, improves engine performance thereby promptly adjust alternate-engine circuit burning quality.Therefore other indicator of SOC and burning quality is benefited from more exactly, determined enduringly to the HCCI h type engine h.
Except that above-mentioned HCCI example, if except the system monitoring performance of real-time diagnosis purpose, do not have other reason, so burning quality knowledge as the burning beginning and speed at commercial diesel engine and the SI motor of helping.The measurement that these motors can adopt correct action to compensate burning quality changes, thereby keeps higher motor fuel Economy and lower engine emission.
The direct pressure that the known technology of estimated engine circuit burning quality depends in the firing chamber is measured; For example, by sensor being set with the departure of measurement with the contacted film of in-cylinder pressure.Measured pressure signal is relevant with SOC or other burning quality indicator.For example feedback control loop is used to by making the error minimum between measured SOC and the target SOC adjust engine parameter to influence alternate-engine circuit SOC.Referring to U.S. Patent No. 6598468 and D.B.P. No.4341796.5, these patent disclosures the direct method of measurement of signal of the pressure of expression in the firing chamber.Typically, optical sensor or other direct pressure surveying instrument have been used.Although the burning quality indicator is quite accurate, these sensors are very expensive and/or lack the needed reliability of many application and durability (because the environment in the firing chamber is very poor) at present.
Be used for estimating that other technology of chamber pressure used detonation sensor (accelerometer) as being disclosed in the sensor in the U.S. Patent No. 6408819.Although accelerometer is inexpensive, and compare with the direct pressure measuring transducer, reliable more at present and durability more, but it has such shortcoming, this technology depends on the method for rebuilding pressure signal, and this pressure signal for the many burning quality controlling methods that comprise effective SOC be not enough accurately.
Use accelerometer, efficient system is disclosed in that on April 12nd, 2004 submitted to, name and is called among the pending trial U. S. Patent series No.10/822333 " Method And Apparatus For Controlling An InternalCombustion Engine Using Accelerometer ", the applicant (" ' 333 ") more, the full content of this patent application is here introduced with for referencial use.Be not to rebuild pressure signal by accelerometer data, ' 333 the application but rate of heat release reconstruction (HRR) method is disclosed to take out combustion information from original accelerometer data.
After deliberation the effectiveness of above-mentioned technology whether can be enhanced.
Summary of the invention
According to top these, the technology of having described is at present sought provides improving one's methods and system of a kind of burning quality of determining to comprise SOC in internal-combustion engine, and wherein new method and system can be used in various engine application more effectively as in burning control or the combustion diagnosis.
This can be realized by the auxiliary pretreatment of original accelerometer data.
The advantage of present described technology is, pretreatment has improved the quality that supplies to the data in the heat release reforming method, thereby can cause that combustion sensor is more durable, reliable, expense is low.
Another advantage of present described technology is that it provides the real-time estimation of burning quality and SOC.
In order to use acceierometer sensor to come effectively to determine SOC, so the applicant finds, before rebuilding rate of heat release and making these data and SOC is relevant, separates from original accelerometer data with the relevant data of burning and has favourable part.This technology is favourable, because the accelerometer collection that is installed on the correct position of motor comprises because the vibration relevant with combustion process of the data that engine part motion and combustion process are produced.
Correspondingly, present described technology provides a kind of accelerometer data of handling to take out the method and apparatus of the data relevant with burning.
According to present described technology, a kind of method of handling the accelerometer signal relevant with combustion process in the work internal-combustion engine is provided, this method comprises these steps:
A. in the cycle period of described motor, measure accelerometer signal in the window of selected degree in crank angle, measured accelerometer signal comprises the acceleration component of burning acceleration component and towing astern (motored); And
B. shape function (shape function) is applied in the described accelerometer signal that records to reduce the acceleration component of described towing astern.
In another embodiment, by estimating shape function with the described motor of the mode manipulation of towing astern.
In another embodiment, before being applied to the accelerometer signal that records, pivot technology (pivoting technique) is applied in the shape function.
In another embodiment, reflection technology be applied to shape function and the signal for faster that records between difference on.
In another embodiment, differential technology be applied to shape and the accelerometer signal that records between difference on.
Another embodiment according to present described technology, a kind of system of control burning in charge compression ignition engine is provided, wherein accelerometer signal is fed into the microcontroller based on dsp chip, there, in dsp controller, carry out this method step to produce combustion information.
Description of drawings
Preferred embodiment shown in the accompanying drawing, present described technology following described in detail more and makes the above-mentioned of present described technology and other purpose, feature and advantage clearer, in the accompanying drawings, same numeral is represented identical parts in all different views.These accompanying drawings needn't proportionally draw, but focus on the principle that present described technology is shown.
Fig. 1 is the embodiment's of present described technology the schematic representation of combustion control system;
Fig. 2 A is used for handling according to the embodiment of present described technology the flow chart of the step of accelerometer signal;
Fig. 2 B shows the signal of each step of Fig. 2 A;
Fig. 3 is a plotted curve, and it shows accelerometer data;
Fig. 4 A is a plotted curve, and it shows an accelerometer data embodiment, that handled of present described technology;
Fig. 4 B is a plotted curve, and it shows the accelerometer data another embodiment, that handled of present described technology;
Fig. 4 C is a plotted curve, and it shows the accelerometer data another embodiment, that handled of present described technology; And
Fig. 5 is a schematic representation, and it shows according to an embodiment's of present described technology bearing cap and selects.
Embodiment
Present described technology relates to a kind of use accelerometer data and determines combustion in IC engine method for quality and device.Usually, for purposes of this disclosure, use disclosed method can measure burning quality as catch fire, rate of combustion, peak cylinder pressure, burning phase (for example SOC).An advantage measuring burning quality provides the measurement of engine performance, thereby has the ability to regulate engine performance in the real time, to raise the efficiency, reduces discharging simultaneously.Will be appreciated that, can be applied in the various different internal-combustion engines according to following apparatus and method disclosed here, present described technology, these internal-combustion engines comprise diesel engine, spark-ignition gasoline machine, alternative-fuel engine and can carry out the distortion (but being not limited to this) of work with the improvement thermal cycle.Present described technology can be used in many this motors to determine and the monitoring burning quality, thus help improving engine efficiency, reduce discharging or for other purposes as carrying out combustion diagnosis.
More particularly, present described technology relates to the improvement based on the method for accelerometer, and this method can be determined burning quality such as SOC, and these are disclosed in ' 333 applications in front.The embodiment of present described technology relates to processing accelerometer initial data to improve the improvement place of validity and durability, and is as described below such.
In addition, although many discussion here relate to method, this method is aimed at monitoring or definite SOC, but as involved here known to the those of ordinary skills in this technology like that, accelerometer data and resulting from these data, the synthetic heat release trace of handling can be applied to the method for control or assessment burning quality aspect, this burning quality comprise peak cylinder pressure, peak cylinder pressure position, rate of combustion, burning phase, catch fire and premature combustion, but be not limited to this.
Now, with reference to Fig. 1, the embodiment of present described technology can be applied in the shown motor 100.Motor 100 comprises cylinder body (for simple and easy purpose, only show a cylinder, but motor generally having two or more a plurality of cylinder), and this cylinder body has cylinder 14 and pistons reciprocating 16, and this piston 16 is arranged at wherein to drive bent axle 18.Thereby various intake valves and exhaust valve (not shown) are connected with cylinder and are transported to air inlet in the cylinder and the discharge by-product, because this motor also comprises fuel and air conveying system and other modular system relevant with internal-combustion engine.
In when work, the degree in crank angle θ that limits according to the user with sampling frequency fSR based on the burning quality processing system 12 of DSP begins the numeral (AD) of acceierometer sensor signal taken a sample and simulates.After sampling was finished, controller was carried out the signal processing algorithm.Typically, computing time is less than the every circulation 10ms of every cylinder.Result of calculation is delivered in the master controller by the CAN bus.Then, master controller can use the information that is used for diagnostic purpose, thereby carries out closed loop control on single cylinder SOC, perhaps for it has been generally acknowledged that many other purposes that relate to burning quality.
In the following description, the term monitoring mode relates to the engine cycles that does not have fuel to spray and do not burn and produce simply.
With reference to Fig. 2 A, show according to the embodiment of the technology of describing now, handle accelerometer 22 signals to carry out the flow chart of the general step in the improving one's methods of burning quality control by DSP20.Fig. 2 B shows and the corresponding signal of each step with curve.This method comprises: obtain sensing data in step 402; Processing data in step 403; In step 404, Cepstral filtering (smoothing) and transfer function are applied in the pretreated sensing data calculating the HRR tracking signal, and from the HRR tracking signal that is calculated, take out burning quality information.Pre-treatment step 403 will be disclosed emphasis.
Fig. 3 shows the chart of typical original accelerometer signal 300, and this signal 300 records by the accelerometer 22 that is installed on motor 100 main bearing cap in step 420.The chart 310 of supposing rate of heat release produces during engine cycles.As shown,-50 degree ATDC and+determine accelerometer signal 300 on the window of the degree in crank angle of 60 degree between the ATDC.The crankangle window concentrates in the combustion process timing of engine cycles.Original accelerometer signal 300 is considered to have two principal components.The first, have basic (underlying) signal 302 relevant with acceleration, this acceleration is produced by the monitor force variable of cylinder, and it is called the acceleration component of towing astern.The second, have the acceleration relevant with the aux. pressure on the piston, this aux. pressure is produced by burning signal 304, and it is called the burning acceleration component, can take out this information such as heat release trace 310 in this component.In these data, find other component, but the acceleration component of towing astern and burning acceleration component are considered to arrange this signal in the selected sample scope.Usually, burning is finished after TDC sometimes.After this time, burning except with expansion stroke during piston motion also be unfavorable for the pressure increase relevant.Along with original accelerometer signal 300 rates of decay slightly greater than the rate of decay of the acceleration component 302 of towing astern, the acceleration component 302 of original accelerometer 300 and towing astern is assembled.From original accelerometer signal, deduct the acceleration component of towing astern, can produce the signal that is called difference signal 304.Difference signal 304 is relevant with the acceleration that is produced owing to burn acceleration component.Notice that about smooth poor acceleration component 304 responses after burning 306 are near finishing.Be included in ignition point 306 finish before these information in the signal for faster 300 of (be illustrated in this embodiment ,+20 degree ATDC on) are the measured values of influence of acceleration component of always burning.Has finite information on the rate of combustion after ignition point 306 finishes.Processing method be formed with apply the front ' 333 the application described in and referring to Cepstral filtering and renovation technique before from original accelerometer signal 300, remove as much non-rate of combustion information.Use above-mentioned preprocess method to have some advantages.At first, the burning acceleration component obviously improves with the ratio of noise.Second by-product is, use preconditioning technique do not need to handle big data sample collection (from before the TDC after TDC) to reduce the effect of non-null boundary.This sample that reduced is set and has been reduced computing time.
As described herein, the embodiment of present described technology shows the preprocess method of the potential trend that is used for removing the data relevant with piston motion.The preprocess method of present described technology comprises and limits shape function that this shape function is imitated the acceleration component 302 of towing astern shown in Figure 3.When motor is in towing astern pattern (motoring mode), shape function usually and accelerometer signal 300 be complementary.The shape function 302 acceleration component, that match and the difference 304 between the original accelerometer signal 300 of expression towing astern produce the accelerometer data collection with how main burning acceleration component for given cylinder, promptly remove the acceleration component of more basic piston motion signal, towing astern.
During the calibration process of given motor, obtain the acceleration component of towing astern, to determine suitable shape function.Under different engine conditions, specified data from cylinder.Different engine conditions comprise different engine rotary speeds, load or cylinder pressure.The phase place of the acceleration component of towing astern can move many number of degrees according to these factors such as cylinder pressure, engine speed and engine load.Preferably, under most engine condition, on each cylinder, use a shape function.
In one embodiment, thus a kind of suitable adjustment shape function correctly mates the acceleration component of towing astern under most of engine conditions method is desirable.A kind of suitable adjustment shape function phase or precognition should use the method for what shape function as described belowly to use like that for given original accelerometer signal 300.
In another embodiment, can dynamically or on real-time basis, determine shape function (shape function).For example, motor can periodically catch fire by the manipulator, and can adopt the measurement of towing astern.Typically, come retarded combustion, and during compression stroke, determine to carry out this in the place that is the peak value of the motor function measured in the mode of control.This can be to realize manipulator's transparent way.
In another embodiment, definite use that combines with the suitable adjustment of shape function of shape function on real-time basis.
With reference to Fig. 4 A, first technology of pretreatment accelerometer information obtains proof and is described to pivot method (pivot method).Suppose to determine as previously described measured original signal for faster 300 data and the acceleration component 302 of towing astern.The pretreatment of signal results from the step 403 of Fig. 2.At first, deduct shape function from primary signal before, shape function preferably is coupled in the original accelerometer signal 300.From about-40 degree ATDC to by on the piston motion scope of TDC, promptly usually before combustion chambers burn, accelerometer 22 produces Files, only results from piston motion in these nearly all data.Therefore, the crank angle that shape function matches in the initial data realizes in compression stroke, more particularly, spends ATDC between the TDC-40.As following, carry out this coupling.
I is on fixing degree in crank angle (for example-30 degree ATDC), and the shape function of the acceleration component of original accelerometer signal and expression towing astern is fixed and remains zero;
Ii calculates the inclination of (for example spending between-15 degree ATDC) original accelerometer signal data and shape function during compression mutually-25.Calculate original accelerometer zero cross point and shape function zero cross point then.By extending from the point that falls in the crank angle range, calculate this zero cross point, wherein in this scope, calculate corresponding inclination.For example, if calculate this inclination between-25 to-15 degree ATDC, the line 312 that starts from one 20 degree ATDC so extends to intersect with this zero line downwards.
The iii shape function is carried out phase shift, and therefore the zero cross point of original accelerometer signal data and shape function is consistent.For durability, the phase shifts of shape function is restricted.Can use ± 2 or ± typical limits of 3 degree in crank angles.
Iv is (for example-30 degree ATDC) on fixing degree in crank angle, original accelerometer signal data and shape function be fixed again be maintained to above freezing.
V applies a gain to shape function, thus on the tilt fixing before the TDC size of the original accelerometer signal data of (for example ,-10 degree ATDC) coupling.
Calculate the difference between the shape function of original accelerometer signal data and coupling then.Example from the result of shape function coupling has been shown in Fig. 4 A.These results show the coupling during compression stroke.The front end of synthetic difference signal 304 comprises the information relevant with rate of combustion, and still, the tail end of difference signal 304 comprises the main information relevant with piston motion.Treatment technology disclosed herein takes out the information relevant with rate of combustion from this difference signal.The pivot method is used to force shape function to intersect at 40 degree ATDC places and original accelerometer information data, represents with label 314 in Fig. 4 A.Interpolation is used to the shape function that keeps level and smooth, and wherein identification is near the pivotal point (pivot point) 316 on the shape function 302 of TDC.Interpolation is used to filling shape function vector between pivotal point 316 (TDC) and point of intersection 314 (40 degree ATDC).The synthetic difference curve 318 (difference between initial data and the pivot shape function curve) that pivots is illustrated among Fig. 4 A, and it represents target rate of heat release curve 310 more.But, in some cases, by adopting second method that is called method for reflection here also can remove the acceleration component that relates to on-fuel information such as towing astern.Here, the front edge of accelerometer burning component obtains reflection around the precalculated position on the difference signal data.This result is that the accelerometer burning component of symmetry distributes, and transfer function can be applied in this component distribution to rebuild rate of heat release.Correspondingly, Fig. 4 B shows method for reflection with plotted curve.In addition, suppose to obtain signal 302, the shape function of original signal for faster 300 and towing astern with method described above.Determine the peak value 322 (difference between the measured signal 300 and the signal 302 of towing astern) on the difference curve 304.Note, in limited preselected crank angle, realize the retrieval of peak value.Limited window ranges is used to improve computational efficiency and prevents the influence of noise result by identification " mistake " peak value.Thereby the preferably enough wide scope that covers desired burning phase of this window.-10 degree ATDC are normally suitable scopes to+20 scopes up to+30 ATDC that spend, and still, related here those of ordinary skills should be understood that this scope can change to motor or from the equipment variations to equipment from motor.Calculate and part value relevant time location (degree in crank angle), and should part value relevant with peak value 322.Selected this sub-fraction value (a) thus should can eliminate in the peak relevant with the relatively flat signal of some noises uncertain enough for a short time; And selected should part value (b) enough big, so can not lose a large amount of combustion informations.Suitable part value can be from 50% to 99%, and here, 90% value is preferred.Thereby then greatly about making the position reflection on the poor curve 302 before 90% position produce the relevant acceleration curve of symmetry burning on this position.In addition, wave filter can be applied on the top around the reflection profile of peak value, so that the peak value perfection.This method is very good for the HCCI h type engine h.
In another embodiment of present described technology, by adopting differential method also can remove the relevant information of non-burning.As adopt above-mentioned other two kinds of methods, this method can be applied on the poor curve 304.Poor curve 304 shown in Figure 3 is differentiated, thereby obtain and the similar curve of the rate of heat release 310 of integration.The result of this method is illustrated among Fig. 4 C with plotted curve.Difference curve 304 is differentiated and can be obtained derivative curve 324, and in this curve, differential method can be removed the influence of foregoing end effect.Notice that differential method comprises that many steps guarantee durability.At first, wave filter is applied in the original accelerometer signal data to guarantee level and smooth relatively result when difference signal carries out differential.In order to reduce the influence of the wave filter on the phase information, so the finite impulse response (FIR) mode filter is preferred.The quantity of the utmost point and can cause in cutoff frequency, transition region length, the logical fluctuation of band and the adaptation between computing time with the extremely relevant value of wave filter.By example, 19 utmost point wave filter work get very good, and are very little to the influence of phase information, and differential signal keeps level and smooth relatively simultaneously, and in this wave filter, the value of filter tap is to decay to basis (that is, this decay and representation { (x/ δ) with the Gaussian type
2Proportional, here, x represents the distance of tap apart from filter center, and that δ is selected to the edge of guaranteeing wave filter is relevant with x value between 2 and 3 times δ value).
The second, have been found that mismatch between shape function and original accelerometer signal data causes the misjudgment of early stage rate of heat release.These problems have occurred, because singular shape function is used for nearly all speed and loading condiction, here the inclination of shape function can not accurately be mated the inclination near the original accelerometer data signal of upper dead center.For pivot and reflection technology, mismatch has reduced the ratio of signal to noise really.But for differential method, this problem worse is because differential has enlarged the influence of mismatch.A kind of method is solved this problem by development.This method comprises that the peak that makes differential signal is as the reference position.Set time or the information on the interval of the degree in crank angle before the peak are set to 0.Combining when using with being disclosed in ' No. 333 Cepstral filtering methods in the application, this method work gets very good.Other method also can be used for addressing this problem.For example, according to threshold value, make whole differential signal can downward bias from, thereby eliminate the influence of early stage mismatch.Using peak is preferable methods as this method of reference position.
Last surface technology has proposed endurance issues.For example, under nonknocking condition, the size of first peak value relevant with mismatch be with the burning corresponding main peak value size a part.Usually, first peak value is in 10% scope of this main peak value.But when burning was delayed with respect to normal combustion or shifts to an earlier date, the size of main peak value began to reduce, and the size of while mismatch peak value keeps constant relatively or these main peak values are additionally disturbed first peak value.In each case, relevant with burning peak value is difficult to identification more.Usually, if the absolute size of each peak value less than threshold value, motor is considered to have and catches fire so.But, if absolute size greater than this threshold value, and the size of first peak value is less than the estimated rate of the second peak value size, second peak value is selected as the said reference position so.By example, typically, have first peak value of 75% relative size or the second littler peak value size and make second peak value selected as the reference position.But,, so usually select first peak value if relative size is higher than this threshold size-75% in the example that is provided.
Other technology also can be used for compensating the relevant acceleration information of non-burning.For example, can be used for foretelling the rate of decay of given accelerometer signal based on the method for model.
Next step in the processing is to construct HRR in the resulting signal from promptly pivot by an above-mentioned preprocess method method, method for reflection and differential method.The schematic representation of main bearing cap and cylinder illustrates in Fig. 5.Each cylinder has two bearing caps.A potential problem is whether ignition order influences the lid pairing of supporting cylinder.Usually find that most of bearing caps/cylinder is in conjunction with spendable burning quality information will be provided.Preferably, select in conjunction with selecting to carry out shape function for each bearing cap/cylinder.In addition, should be concerned about and guarantee that signal quality can be accepted promptly have relatively large signal to noise ratio.For example, in combustion process, can observe noise spike, observe for certain cylinder/bearing cap combination there.On second motor, the signal that covers from specific bearing can have not relevant with driving or combustion process homophase low-frequency fluctuation.Low-frequency fluctuation can be a homophase, but having some shakes mutually.Under every kind of situation, this result usually is that unacceptable little signal is to noise ratio in the above.Therefore, when selecting bearing cap/cylinder combination, should pay close attention to.For redundancy purpose, it is favourable that two sensors are installed on the bearing cap, and these bearing caps provide acceptable combustion information for two contiguous cylinders.
In a word, four step method are described to take out combustion information from original accelerometer data as following.At first, the accelerometer signal that records is broken down into acceleration (shape function) component of burning and towing astern.The second, use transfer function, rebuild rate of heat release by the burning component.Latter two steps comprises: take out burning quality information from rebuild heat release.Preprocess method is used to remove the relevant information of more non-burning, can cause obviously improving the SOC prophesy.On hcci engine, can prove SOC control system ability based on accelerometer.Based on the control system of accelerometer have with based on the identical ability of the SOC control system of in-cylinder pressure sensor.Formed algorithm causes spendable, reliable burning to be estimated mutually.
Although the special element and the embodiment of present described technology are shown and described, but will be appreciated that certainly, present described technology is not limited to this, because do not break away from the scope of the present disclosure, especially according to the scope situation of instructing previously under, those of ordinary skills can improve.
Claims (3)
1. method of in the work internal-combustion engine, handling the accelerometer signal relevant with combustion process, this method comprises these steps:
A) in the cycle period of described motor, in the window of selected degree in crank angle, measure accelerometer signal, measured accelerometer signal comprises the acceleration component of burning acceleration component and towing astern; And
B) shape function is applied in the described accelerometer signal that records to reduce the acceleration component of described towing astern.
2. method according to claim 1 is characterized in that, also comprises a pre-treatment step of choosing among the following steps:
A) described apply step before, described shape function is pivoted;
B) apply in the step described, determine the difference signal between described accelerometer signal that records and the described shape function, thereby and take out described burning component in the part of the described difference signal of predetermined crank angle peripheral reflection;
C) apply in the step described, determine the difference signal between described accelerometer signal that records and the described shape function and described difference signal carried out differential to take out described burning component.
3. method according to claim 2 is characterized in that, also comprises step, promptly before described pre-treatment step, described shape function is applied phase shift.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US62948904P | 2004-11-18 | 2004-11-18 | |
| US60/629,489 | 2004-11-18 | ||
| PCT/CA2005/001755 WO2006053438A1 (en) | 2004-11-18 | 2005-11-18 | System and method for processing an accelerometer signal to assist in combustion quality control in an internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101061297A true CN101061297A (en) | 2007-10-24 |
| CN101061297B CN101061297B (en) | 2010-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200580039312.2A Active CN101061297B (en) | 2004-11-18 | 2005-11-18 | System and method for processing an accelerometer signal to assist in combustion quality control in an internal combustion engine |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1812701A4 (en) |
| JP (1) | JP2008520876A (en) |
| CN (1) | CN101061297B (en) |
| AU (1) | AU2005306541B2 (en) |
| WO (1) | WO2006053438A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102022244A (en) * | 2009-09-16 | 2011-04-20 | 通用汽车环球科技运作公司 | Pattern recognition for random misfire |
| CN102498378A (en) * | 2009-07-31 | 2012-06-13 | 西港能源有限公司 | Method and apparatus for reconstructing in-cylinder pressure and correcting for signal decay |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7444231B2 (en) | 2004-11-18 | 2008-10-28 | Westport Power Inc. | Method of mounting an accelerometer on an internal combustion engine and increasing signal-to-noise ratio |
| DE102007020764A1 (en) | 2007-05-03 | 2008-03-27 | Schoen, Andre, Dr. | Internal combustion engine operating method, involves measuring time period directly or indirectly in operating cycle of engine, to which mixture of ignition provided in cylinder changes in combustion phase or when combustion phase begins |
| JP6024482B2 (en) * | 2013-01-28 | 2016-11-16 | 株式会社デンソー | Control device for hybrid vehicle |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04331329A (en) * | 1991-05-07 | 1992-11-19 | Japan Electron Control Syst Co Ltd | Self-diagnostic device in knocking detection device of internal combustion engine |
| JP3780549B2 (en) * | 1995-11-27 | 2006-05-31 | 株式会社デンソー | Fuel injection timing control device |
| CN1233313B (en) * | 1996-08-23 | 2013-01-02 | 卡明斯发动机公司 | Premixed charge compression ignition engine with optimal combustion control |
| US5789667A (en) * | 1997-04-25 | 1998-08-04 | Leader; David N. | Apparatus and method for testing electric motors |
| WO1999017010A1 (en) * | 1997-09-29 | 1999-04-08 | Siemens Aktiengesellschaft | Method for monitoring an injection system |
| US6273064B1 (en) * | 2000-01-13 | 2001-08-14 | Ford Global Technologies, Inc. | Controller and control method for an internal combustion engine using an engine-mounted accelerometer |
| JP2003003883A (en) * | 2001-06-22 | 2003-01-08 | Nippon Soken Inc | Method of detecting combustion condition of diesel engine |
| DE50308657D1 (en) * | 2002-07-02 | 2008-01-03 | Bosch Gmbh Robert | Method and device for controlling a combustion engine |
| FR2844830B1 (en) * | 2002-09-23 | 2006-06-02 | Peugeot Citroen Automobiles Sa | SYSTEM FOR MONITORING THE OPERATION OF A DIESEL ENGINE OF A MOTOR VEHICLE |
| JP4211565B2 (en) * | 2003-10-16 | 2009-01-21 | いすゞ自動車株式会社 | Cylinder internal pressure detection method |
-
2005
- 2005-11-18 AU AU2005306541A patent/AU2005306541B2/en active Active
- 2005-11-18 WO PCT/CA2005/001755 patent/WO2006053438A1/en not_active Application Discontinuation
- 2005-11-18 EP EP05810779A patent/EP1812701A4/en not_active Withdrawn
- 2005-11-18 JP JP2007541604A patent/JP2008520876A/en active Pending
- 2005-11-18 CN CN200580039312.2A patent/CN101061297B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102498378A (en) * | 2009-07-31 | 2012-06-13 | 西港能源有限公司 | Method and apparatus for reconstructing in-cylinder pressure and correcting for signal decay |
| CN102498378B (en) * | 2009-07-31 | 2015-03-11 | 西港能源有限公司 | Method and apparatus for reconstructing in-cylinder pressure and correcting for signal decay |
| CN102022244A (en) * | 2009-09-16 | 2011-04-20 | 通用汽车环球科技运作公司 | Pattern recognition for random misfire |
| CN102022244B (en) * | 2009-09-16 | 2013-11-13 | 通用汽车环球科技运作公司 | Pattern recognition for random misfire |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1812701A1 (en) | 2007-08-01 |
| CN101061297B (en) | 2010-06-23 |
| AU2005306541A1 (en) | 2006-05-26 |
| JP2008520876A (en) | 2008-06-19 |
| AU2005306541B2 (en) | 2009-01-15 |
| WO2006053438A1 (en) | 2006-05-26 |
| EP1812701A4 (en) | 2008-01-23 |
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